R Under development (unstable) (2023-09-30 r85239 ucrt) -- "Unsuffered Consequences"
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> 
> library(lattice)
> 
> pdf("shade-wireframe.pdf")
> 
> classicShadePalette <- function(irr, ref, height, saturation = .9)
+ {
+     hsv(h = height, s = 1 - saturation * (1 - (1-ref)^0.5), v = irr)
+ }
> trellis.par.set(shade.colors = list(palette = classicShadePalette))
> wireframe(volcano, shade = TRUE)
> 
> ## Using makeShadePalette()
> 
> ## matte
> cm.palette <- makeShadePalette(cm.colors(10), pref = 0.2)
> trellis.par.set(shade.colors = list(palette = cm.palette))
> wireframe(volcano, shade = TRUE)
> 
> ## glossy
> cm.palette <- makeShadePalette(cm.colors(10), pref = 1.2)
> trellis.par.set(shade.colors = list(palette = cm.palette))
> wireframe(volcano, shade = TRUE)
> 
> ygb.palette <- makeShadePalette(rev(hcl.colors(12, "YlGnBu")))
> trellis.par.set(shade.colors = list(palette = ygb.palette))
> wireframe(volcano, shade = TRUE)
> 
> dev.off()
null device 
          1 
> 
> proc.time()
   user  system elapsed 
   2.70    0.09    2.78